According to the third edition of the Shorter Oxford Dictionary, an interjection is a grammatical term "expressing emotion, viewed as a Part of Speech." Wikipedia describes an interjection as "a word or expression that occurs as an utterance on its own and expresses a spontaneous feeling or reaction" that furthermore "partly overlaps with categories like profanities, discourse markers and fillers."

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In German too, some interjections are also standard nouns, but most are basically sounds that express emotion. Here are some examples of German interjections that are nearly identical to English: